How to hide background contents of window.open while printing in Angular

Question

I have running Angular 12 application and I am integrating the behavior to print report. I am able to achieve the print on button click which opens a new window, but I am not able to figure out how to achieve below things:

1. Remove background contents on window.open so that the print window looks like a normal print window which we see by pressing Win+P in our browser.
2. Center the print window popup in the screen.
3. Not able to display images in print window. If I add any img tag in html like: <img src="assets/images/galaxy.png" alt="">, the image is not getting displayed in the print window. If I comment window.print() and just use window.open(), image is getting displayed

print.service.ts

  showDialog() {
    const factory =
      this.componentFactoryResolver.resolveComponentFactory(PrintReportComponent);

    const dialogComponentRef = factory.create(this.injector);
    dialogComponentRef.instance.title = 'Report';

    dialogComponentRef.changeDetectorRef.detectChanges();

    //fetch the root DOM element of ModalComponent
    const domElement = (dialogComponentRef.hostView as EmbeddedViewRef<any>)
      .rootNodes[0] as HTMLElement;

    const WindowPrt = window.open(
      '',
      '',
      'top=0,left=0,height=100%,width=auto'
    );
    WindowPrt.document.head.innerHTML = document.head.innerHTML;
    WindowPrt.document.body.innerHTML = domElement.outerHTML;
    WindowPrt.document.close();
    WindowPrt.focus();
    WindowPrt.print();
    WindowPrt.close();
  }

stackblitz link: https://stackblitz.com/edit/angular-ivy-c1ewya?file=src%2Fapp%2Fprint.service.ts

Answer 1

In this part :

const WindowPrt = window.open(
      '',
      '',
      'top=0,left=0,height=100%,width=auto'
    );

You have to remove '', ''. change to :

const WindowPrt = window.open(
          'top=0,left=0,height=100%,width=auto'
        );

Answer 2

You should change your strategy at all. If you will do this, it will work. Please try this example one:

link-stackblitz

I added one dummy image in it and it is displayed.

Good luck ;)